Top definition
The foul gas that emanates from ones anus thus having a certain shit waft.

'Shit gas' must not be mistaken for a 'fart' - 'shit gas' is far more potent and offensive.
One could say "What is that dreadful smell? It smells like 'shit gas'.
"I can smell 'shit gas', is that you Gary?"
"My god, what have you eaten? - Your 'shit gas' stinks.
by p_levo January 06, 2016
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